Motown: Add examples/media_test, a command line media player app.

examples/media_test/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//mojo/public/mojo_application.gni")
 
-mojo_native_application("moterm_example_app") {
+mojo_native_application("media_test") {
   sources = [
-    "moterm_example_app.cc",
+    "keystroke.cc",
+    "keystroke.h",
+    "media_test.cc",
+    "media_test.h",
+    "media_test_app.cc",
   ]
 
   deps = [
     "//base",
     "//mojo/application",
-    "//mojo/common",
+    "//mojo/environment:chromium",
+    "//mojo/gpu",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/utility",
     "//mojo/public/interfaces/application",
-    "//mojo/services/files/interfaces",
-    "//mojo/services/geometry/interfaces",
-    "//mojo/services/terminal/interfaces",
-    "//mojo/services/ui/views/interfaces",
-    "//mojo/ui",
+    "//mojo/services/media/common/cpp",
+    "//mojo/services/media/common/interfaces",
+    "//mojo/services/media/control/interfaces",
   ]
 }